Reamer



PATENTED DEC. 22, 1903.

F. G. EOHOLS.

REAMER. APPLICATION FILED JUNE 3. 1903.

N0 MODEL.

n IS PETIRS c0. PHOTO-LITHO.. wuumurow n c UNITED STATES FRANCISG.ECHOLS, OF HARTFORD Patented December 22, 1903.

PATENT OFFICE.

, CONNECTICUT, ASSIGNOR TO PRATT OF NE W JERSEY.

REAM ER.

SPECIFICATION iormingpart of Letters Patent No. 747,907, dated December1903- Application filed June 3, 1903.

Serial No. 159,860. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS G. ECHOLS, a citizen of the United States,residing at Hartford, in the county of Hartford and State of IConnecticut, have invented certain new and useful Improvements inReamers, of which the following is a specification.

My invent-ion relates to reamers, and par ticularly to that class ofsuch tools known as IO expanding reamers; and it has for its object theprovision of a simple and improved construction whereby thecutting-blades of the reamer may be readily adjusted and then clampedfirmly in position.

' A further object of the invention is the provision of a reamer thestock of which is provided with a series of grooves having inclinedbottoms for the reception of the cutting-blades, said grooves beingbisected by a circumferential groove in which blocks or segments arefitted for clampingthe cutting blades firmly in position after they havebeen adjusted.

A further object of the invention is the provision of a reamer body orstock having a circumferential groove and longitudinal grooves, as abovedescribed, segmental blocks of peculiarconstruction adapted to besecured in said grooves by screws or otherwise, and

I cutting-blades, also of peculiar construction,

clamped in place by said blocks.

In the accompanying drawings, Figure l is a side elevation, partially insection, of my improved reamer. Fig. 2 is an end elevation, partially insection, on line 2 2 of Fig.

1. Fig. 3 is a transverse section of my improved reamer on line 3 3 ofFig. 1. Fig. 4 isa side elevation of one of the cutting-blades, and Fig.5 is a perspective view of one of the clamping blocks or segments.

Like numerals designate similar parts throughout the several views.

Referring to the drawings, the numeral 5 designates the tubular. stockor body of the I 5 reamer, and in the-periphery of said stock are formedseparated longitudinal grooves '6 for the reception of thecutting-blades 7.

Adjacent to the forward end of thestock a circumferential groove 8 isformed therein, said groove being located at right angles to the grooves6.

Each cutting-blade is of tapering form,it being wider at the front end,whereit is provided with a longitudinal groove 9, having rounded endwalls 9' for apurpose hereinafter stated, and each blade is alsoprovided with a beveled rear end 10, adapted to be engaged by theinwardly-inclined end wall of a ring or collet 12, mounted on thereduced shank 5' of the reamer-stock. This shank is externally threadedat 13 for the reception of a nut 14, said nut having a series ofseparated holes in its periphery adapted to receive a tool for adjustingthe nut and the walls of one of these holes being internally threadedfor the reception of a lockingscrew 15, by which the nut may be securedin position after adjustment. This nut bears against the collet or ring12, and by adjusting said not it will be seen that thering may beadvanced upon the stock, and its beveled end being in contact with thereversely-beveled extremities of the blades 7 will thus force saidblades forward in their seats or grooves therein, this operation beingnecessary to withdraw theblades within said grooves b when it is desiredto decrease the diameter of the reamer.

or segments having inclined ends 16' for fitting against the faces ofthe reamer-blades, as illustrated in Fig; 2. At their opposite endseachof these blocks isalso inclined at 16 and is provided with roundedcorners 16 for fitting and engaging the rounded end walls 9' of thegrooves 9 in blades 7 when said blades are adjusted to the limit oftheir movement in either direction.. Each block or segment 16 isperforated at 17 for the reception of a screw 18, as illustrated moreparticularlyin Fig. 2.

face of the reamer, the screws 18 are loosened, thereby releasing theblocks 16 from their clamping action against the cuttingblades, and thenut 14 and collet 12 having been adjusted pressure is applied to theends of the cutting-blades to move them up the inclined bottom walls oftheir retaining-grooves until the desired adjustment is effected, whenthe screws are tightened, and the inclined Designated by 16 areconcavo-convex blocks.

To increase the diameter of the cutting-slur 6 and will at the same timehold them down walls of the concavo-convex blocks or segments 16 arecaused to bind against the opposite sides of said cutting-blades, thuslocking them securely in position, after which the set-screw 15 may beturned to clamp the nut 14: and ring or collet 12 in place. It will thusbe seen that a simple and compact construction is provided, one that iscomposed of few parts, and one in which the cutting-blades may be eitherwithdrawn or extended to change the diameter of the working surfaces ofthe reamer as may be desired, and one in which said blades afteradjustment may be firmly locked against displacement.

Changes may be made in the form and proportions of the parts and in thedetails thereof without departure from the invention, which is notlimited to the exact construction illustrated and described.

Having thus described my invention, what I claim is- 1. In a reamer, thecombination, with a stock or body having a series of longitudinalgrooves and a transverse, circumferential groove, of cutting-bladesseated in the longitudinal grooves; segmental blocks having inclinedends fitted in the circumferential groove between the longitudinalgrooves; and means for clamping said blocks against the sides of thecutting-blades.

2. The combination, with a stock or body having separated, longitudinalgrooves with inclined bottom walls and a transverse circumferentialgroove intersecting said longitudinal grooves, of cutting-blades each ofa width greater atone end than at the other, and eachhavingalongitudinal groove; segmental blocks fitted in thecircumferential groove of the stock and each having an inclined end forfitting against one side of a cutting-blade and an inclined end withrounded corners for engaging the groove on the opposite side of saidcutting-blade; means for securing said blocks in position; and anadjustable abutment adapted to engage the inner ends of saidcutting-blades.

3. The combination, with a stock or body having longitudinal grooves anda circumferential groove, of reamer-blades fitted in said longitudinalgrooves; and devices in the circumferential groove for clamping theblades in position, each of said devices bearing against the opposingsides of a pair of said learner-blades.

mental blocks fitted in the circumferential groove, one block beinglocated between each pair of longitudinal grooves, and each block havinginclined walls for bearing against the face of one cutting-blade and theback of an opposite cutting-blade; and screws engaging threads in thebody for clamping the blocks against said blades.

6. The combination, with a stock or body having a series of separated,longitudinal grooves of gradually'decreasing depth from front to rear,and also having a circumferential groove intersecting said longitudinalgrooves, and a shank provided with an external screw-thread, of taperingcutting-blades, each having a longitudinal groove with rounded cornersadjacent to its one end, and each also having an inclined, innerextremity; a ring or collet mounted on the shank and having abeveled'surface for engaging the inclined ends of the cutting blades; anut threaded upon the shank and adapted to engage said collet; means forlockingsaid nut in position after adjustment; segmental blocks, eachhaving inclined ends, and the blocks being located in thecircumferential groove, one between each pair of the longitudinalgrooves, and one end of each block having an inclined surface and theopposite end an inclined surface with rounded corners; and screwspassing through the blocks and entering the stock of the reamer.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS G. EOHOLS.

Witnesses:

E. D. CLARK, W. N. LARKUM.

